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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Forward commodity contracts included in Commodity derivative assets -current $ 55,630 $ 37,560
Forward commodity contracts included in Commodity derivative assets - noncurrent 1,906 2,289
Forward commodity contracts included in Commodity derivative liabilities -current (33,277) (15,874)
Forward commodity contracts included in Commodity derivative liabilities - noncurrent (1,134) (1,519)
Regulated futures and options contracts included in Commodity derivatives 60,738 [1] (23,367) [1]
Over-the-counter contracts included in Commodity derivatives 509 [1] 2,887 [1]
Total estimated fair value of commodity derivatives $ 84,372 $ 1,976
[1] The fair value of futures, options and over-the-counter contracts are offset by cash collateral posted or received and included as a net amount in the Consolidated Balance Sheets.